| Value | Category | Cases | |
|---|---|---|---|
| 1 | Month and year | 22576 |
59.9%
|
| 2 | Month and age -y imp | 9 |
0%
|
| 5 | Year - a, m imp | 1700 |
4.5%
|
| 6 | Age - y, m imp | 574 |
1.5%
|
| 7 | Month - a, y imp | 140 |
0.4%
|
| 8 | None - all imp | 11704 |
31.1%
|
| Sysmiss | 966 |
2.6%
|